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// (C) Copyright 2003-2023 by Autodesk, Inc.
//
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using System;
using System.Windows.Forms;

using Autodesk.Revit.DB;
using Autodesk.Revit.UI;

using TaskDialog = Autodesk.Revit.UI.TaskDialog;

namespace Revit.SDK.Samples.SlabProperties.CS
{
    /// <summary>
    /// Get some properties of a slab , such as Level, Type name, Span direction,
    /// Material name, Thickness, and Young Modulus for the slab's Material.
    /// </summary>
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
    public class Command : IExternalCommand
    {
        #region Class constant variables
        const double PI = 3.1415926535879;
        const int Degree = 180;
        const int ToMillimeter = 1000;
        const double ToMetricThickness = 0.3048;    // unit for changing inch to meter
        const double ToMetricYoungmodulus = 304800.0;

        #endregion


        #region Class member variables

        ElementSet m_slabComponent;  // the selected Slab component
        Floor m_slabFloor; // Floor 
        CompoundStructureLayer m_slabLayer; // Structure Layer 
        System.Collections.Generic.IList<CompoundStructureLayer> m_slabLayerCollection; // Structure Layer collection
        Document m_document;

        string m_level;         // level name of Slab
        string m_typeName;      // type name of Slab
        string m_spanDirection; // span direction (degree) of Slab
        string m_thickness;     // thickness (millimeter) of slab layer
        string m_materialName;  // material name of slab layer
        string m_youngModulusX; // Young modulus X
        string m_youngModulusY; // Young modulus Y
        string m_youngModulusZ; // Young modulus Z
        int m_numberOfLayers;   // number of Structure Layers

        #endregion


        #region Interface implementation
        /// <summary>
        /// Implement this method as an external command for Revit.
        /// </summary>
        /// <param name="commandData">An object that is passed to the external application 
        /// which contains data related to the command, 
        /// such as the application object and active view.</param>
        /// <param name="message">A message that can be set by the external application 
        /// which will be displayed if a failure or cancellation is returned by 
        /// the external command.</param>
        /// <param name="elements">A set of elements to which the external application 
        /// can add elements that are to be highlighted in case of failure or cancellation.</param>
        /// <returns>Return the status of the external command. 
        /// A result of Succeeded means that the API external method functioned as expected. 
        /// Cancelled can be used to signify that the user cancelled the external operation 
        /// at some point. Failure should be returned if the application is unable to proceed with 
        /// the operation.</returns>
        public Autodesk.Revit.UI.Result Execute(Autodesk.Revit.UI.ExternalCommandData commandData, ref string message, Autodesk.Revit.DB.ElementSet elements)
        {
            Autodesk.Revit.UI.UIApplication revit = commandData.Application;

            try
            {
                // function initialization and find out a slab's Level, Type name, and set the Span Direction properties.
                bool isInitialization = this.Initialize(revit);
                if (false == isInitialization)
                {
                    return Autodesk.Revit.UI.Result.Failed;
                }

                // show a displayForm to display the properties of the slab
                SlabPropertiesForm slabForm = new SlabPropertiesForm(this);
                if (DialogResult.OK != slabForm.ShowDialog())
                {
                    return Autodesk.Revit.UI.Result.Cancelled;
                }
            }
            catch (Exception displayProblem)
            {
                TaskDialog.Show("Revit", displayProblem.ToString());
                return Autodesk.Revit.UI.Result.Failed;
            }

            return Autodesk.Revit.UI.Result.Succeeded;
        }
        #endregion


        #region Class propertied
        /// <summary>
        /// Level property, read only.
        /// </summary>
        public string Level
        {
            get
            {
                return m_level;
            }
        }


        /// <summary>
        /// TypeName property, read only.
        /// </summary>
        public string TypeName
        {
            get
            {
                return m_typeName;
            }
        }


        /// <summary>
        /// SpanDirection property, read only.
        /// </summary>
        public string SpanDirection
        {
            get
            {
                return m_spanDirection;
            }
        }


        /// <summary>
        /// NumberOfLayers property, read only.
        /// </summary>
        public int NumberOfLayers
        {
            get
            {
                return m_numberOfLayers;
            }
        }


        /// <summary>
        /// LayerThickness property, read only.
        /// </summary>
        public string LayerThickness
        {
            get
            {
                return m_thickness;
            }
        }


        /// <summary>
        /// LayerMaterialName property, read only.
        /// </summary>
        public string LayerMaterialName
        {
            get
            {
                return m_materialName;
            }
        }


        /// <summary>
        /// LayerYoungModulusX property, read only.
        /// </summary>
        public string LayerYoungModulusX
        {
            get
            {
                return m_youngModulusX;
            }
        }


        /// <summary>
        /// LayerYoungModulusY property, read only.
        /// </summary>
        public string LayerYoungModulusY
        {
            get
            {
                return m_youngModulusY;
            }
        }


        /// <summary>
        /// LayerYoungModulusZ property, read only.
        /// </summary>
        public string LayerYoungModulusZ
        {
            get
            {
                return m_youngModulusZ;
            }
        }
        #endregion


        #region Public class method
        /// <summary>
        /// SetLayer method
        /// </summary>
        /// <param name="layerNumber">The layerNumber for the number of the layers</param>
        public void SetLayer(int layerNumber)
        {
            // Get each layer.
            // An individual layer can be accessed by Layers property and its thickness and material can then be reported.
            m_slabLayer = m_slabLayerCollection[layerNumber];

            // Get the Thickness property and change to the metric millimeter
            m_thickness = ((m_slabLayer.Width) * ToMetricThickness * ToMillimeter).ToString() + " mm";

            // Get the Material name property
            if (ElementId.InvalidElementId != m_slabLayer.MaterialId)
            {
                Material material = m_document.GetElement(m_slabLayer.MaterialId) as Material;
                m_materialName = material.Name;
            }
            else
            {
                m_materialName = "Null";
            }

            // The Young modulus can be found from the material by using the following generic parameters: 
            // PHY_MATERIAL_PARAM_YOUNG_MOD1, PHY_MATERIAL_PARAM_YOUNG_MOD2, PHY_MATERIAL_PARAM_YOUNG_MOD3
            if (ElementId.InvalidElementId != m_slabLayer.MaterialId)
            {
                Material material = m_document.GetElement(m_slabLayer.MaterialId) as Material;
                Parameter youngModuleAttribute = null;
                youngModuleAttribute = material.get_Parameter(BuiltInParameter.PHY_MATERIAL_PARAM_YOUNG_MOD1);
                if (null != youngModuleAttribute)
                {
                    m_youngModulusX = (youngModuleAttribute.AsDouble() / ToMetricYoungmodulus).ToString("F2") + " MPa";
                }
                youngModuleAttribute = material.get_Parameter(BuiltInParameter.PHY_MATERIAL_PARAM_YOUNG_MOD2);
                if (null != youngModuleAttribute)
                {
                    m_youngModulusY = (youngModuleAttribute.AsDouble() / ToMetricYoungmodulus).ToString("F2") + " MPa";
                }
                youngModuleAttribute = material.get_Parameter(BuiltInParameter.PHY_MATERIAL_PARAM_YOUNG_MOD3);
                if (null != youngModuleAttribute)
                {
                    m_youngModulusZ = (youngModuleAttribute.AsDouble() / ToMetricYoungmodulus).ToString("F2") + " MPa";
                }
            }
            else
            {
                m_youngModulusX = "Null";
                m_youngModulusY = "Null";
                m_youngModulusZ = "Null";
            }
        }
        #endregion


        #region Private class memeber methods
        /// <summary>
        /// Initialization and find out a slab's Level, Type name, and set the Span Direction properties.
        /// </summary>
        /// <param name="revit">The revit object for the active instance of Autodesk Revit.</param>
        /// <returns>A value that signifies if your initialization was successful for true or failed for false.</returns>
        private bool Initialize(Autodesk.Revit.UI.UIApplication revit)
        {
            m_slabComponent = new ElementSet();
            foreach (ElementId elementId in revit.ActiveUIDocument.Selection.GetElementIds())
            {
               m_slabComponent.Insert(revit.ActiveUIDocument.Document.GetElement(elementId));
            }
            m_document = revit.ActiveUIDocument.Document;

            // There must be exactly one slab selected
            if (m_slabComponent.IsEmpty)
            {
                // nothing selected
                TaskDialog.Show("Revit", "Please select a slab.");
                return false;
            }
            else if (1 != m_slabComponent.Size)
            {
                // too many things selected
                TaskDialog.Show("Revit", "Please select only one slab.");
                return false;
            }

            foreach (Element e in m_slabComponent)
            {
                // If the element isn't a slab, give the message and return failure. 
                // Else find out its Level, Type name, and set the Span Direction properties. 
                if ("Autodesk.Revit.DB.Floor" != e.GetType().ToString())
                {
                    TaskDialog.Show("Revit", "A slab should be selected.");
                    return false;
                }

                // Change the element type to floor type
                m_slabFloor = e as Floor;

                // Get the layer information from the type object by using the CompoundStructure property
                // The Layers property is then used to retrieve all the layers
                m_slabLayerCollection = m_slabFloor.FloorType.GetCompoundStructure().GetLayers();
                m_numberOfLayers = m_slabLayerCollection.Count;

                // Get the Level property by the floor's Level property
                m_level = (m_document.GetElement(m_slabFloor.LevelId) as Level).Name;

                // Get the Type name property by the floor's FloorType property
                m_typeName = m_slabFloor.FloorType.Name;

                // The span direction can be found using generic parameter access 
                // using the built in parameter FLOOR_PARAM_SPAN_DIRECTION
                Parameter spanDirectionAttribute;
                spanDirectionAttribute = m_slabFloor.get_Parameter(BuiltInParameter.FLOOR_PARAM_SPAN_DIRECTION);
                if (null != spanDirectionAttribute)
                {
                    // Set the Span Direction property
                    this.SetSpanDirection(spanDirectionAttribute.AsDouble());
                }
            }
            return true;
        }


        /// <summary>
        /// Set SpanDirection property to the class private member
        /// Because of the property retrieved from the parameter uses radian for unit, we should change it to degree.
        /// </summary>
        /// <param name="spanDirection">The value of span direction property</param>
        private void SetSpanDirection(double spanDirection)
        {
            double spanDirectionDegree;

            // Change "radian" to "degree".
            spanDirectionDegree = spanDirection / PI * Degree;

            // If the absolute value very small, we consider it to be zero
            if (Math.Abs(spanDirectionDegree) < 1E-12)
            {
                spanDirectionDegree = 0.0;
            }

            // The precision is 0.01, and unit is "degree".
            m_spanDirection = spanDirectionDegree.ToString("F2");
        }
        #endregion
    }
}